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<head>
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    <title>Document</title>
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<body>
    <div class="box"></div>
    <div class="box"></div>
    <div id="main"></div>
    <p class="p1" id="p1"></p>
    <ul>
        <li></li>
    </ul>
    <ul>
        <li>我是文本</li>
    </ul>

    <ul>
        <li class="item1">item number:1</li>
        <li class="item2">item number:2</li>
        <li class="item3">item number:3</li>
    </ul>
</body>

</html>